Decode and analyze JSON Web Tokens (JWT) instantly. View header, payload, and signature data, check expiration status, and review security properties locally.
Standard Claims parameters extracted and validated from the token payload.
| Claim name | JSON key | Extracted parameter value |
|---|---|---|
| Subject | sub | - |
| Issuer | iss | - |
| Audience | aud | - |
| Expiration Time | exp | - |
| Issued At | iat | - |
| Not Before | nbf | - |
| Algorithm | alg (Header) | - |
| Token Type | typ (Header) | - |
Access recent JWT tokens cached in your browser storage.
JSON Web Tokens (JWTs) allow applications to authenticate users without storing session data on the server. All required identity and authorization information can be carried within the token itself, making JWTs popular in modern APIs and microservices.
Every JWT contains a Header, Payload, and Signature. The header defines token metadata, the payload contains claims and user information, and the signature helps verify that the token has not been modified after issuance.
JWT payloads are typically Base64URL encoded, which means their contents can be easily decoded and viewed. Sensitive information such as passwords, API keys, or financial data should never be stored directly inside JWT claims.
Limiting token lifetime reduces the risk associated with stolen credentials. Many systems use short-lived access tokens together with refresh tokens to balance security and user convenience.
Absolutely. All string splitting, base64url decoding, and JSON parsing operations occur entirely client-side using JavaScript inside your browser. No token payloads, credentials, or keys are ever sent across the network.
This tool splits and displays the signature section and warns if the signature part is completely missing. However, verifying cryptographic signatures requires you to input a secret key or public certificate, which we advise against doing on online tools to avoid key leakage.
These are RFC 7519 registered claims: "sub" (Subject) identifies the user/entity, "iss" (Issuer) identifies the auth server, "aud" (Audience) defines intended recipients, "exp" (Expiration Time) marks when the token becomes invalid, and "iat" (Issued At) details when the token was created.
The "none" algorithm indicates that the JWT is unsecured and contains no signature verification. Accepting tokens with "alg: none" makes systems highly vulnerable to spoofing and privilege escalation attacks.
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